Awful big! (9)

I believe the answer is:

monstrous

I believe this clue is a double definition.

'awful' is the first definition.
(thesaurus)

'big' is the second definition.
(similar in meaning)

(Other definitions for monstrous that I've seen before include "Shocking; huge" , "Shockingly brutal or cruel" , "Outrageously evil" , "Quite outrageous" , "Terrible" .)

I've seen this clue in the Evening Standard.

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